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deepaksoni
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Asked: 2021-04-29T07:19:48+05:30 In:

Problem 1: Write the first terms of each of the following sequences whose nth term are:(v) an = (-1)ⁿ2ⁿ

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This is the basic and conceptual question from Chapter name- Arithmetic Progression

Chapter number- 9

Exercise 9.1

Here we have nth term(-1)n.2n of the AP and we are asked to find the first term of it.

CBSE DHANPAT RAI publications

Class:- 10th

Understanding CBSE Mathematics

Question 1 ( v)

apclass 10thrd sharma
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    1. Guru

      Given:

      By putting n = 1, 2, 3, 4, 5 we get first five term of the sequence

      a1 = (-1)1 . 21  = -2

      a2 = (-1)2 . 22  = 4

      a3 = (-1)3 . 23   = -8

      a4 = (-1)4 . 24  = 16

      a5 = (-1)5 . 25  = -32

      ∴ The first five terms are -2, 4, -8, 16, -32

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